diff --git a/langchain-core/src/messages/tests/base_message.test.ts b/langchain-core/src/messages/tests/base_message.test.ts
index fb6f3797f31f..b2b6bd679bd9 100644
--- a/langchain-core/src/messages/tests/base_message.test.ts
+++ b/langchain-core/src/messages/tests/base_message.test.ts
@@ -133,43 +133,43 @@ test("Deserialisation and serialisation of messages with ID", async () => {
   expect(deserialized.id).toBe(messageId);
 });
 
-test("Can concat raw_output (string) of ToolMessageChunk", () => {
+test("Can concat artifact (string) of ToolMessageChunk", () => {
   const rawOutputOne = "Hello";
   const rawOutputTwo = " world";
   const chunk1 = new ToolMessageChunk({
     content: "Hello",
     tool_call_id: "1",
-    raw_output: rawOutputOne,
+    artifact: rawOutputOne,
   });
   const chunk2 = new ToolMessageChunk({
     content: " world",
     tool_call_id: "1",
-    raw_output: rawOutputTwo,
+    artifact: rawOutputTwo,
   });
 
   const concated = chunk1.concat(chunk2);
-  expect(concated.raw_output).toBe(`${rawOutputOne}${rawOutputTwo}`);
+  expect(concated.artifact).toBe(`${rawOutputOne}${rawOutputTwo}`);
 });
 
-test("Can concat raw_output (array) of ToolMessageChunk", () => {
+test("Can concat artifact (array) of ToolMessageChunk", () => {
   const rawOutputOne = ["Hello", " world"];
   const rawOutputTwo = ["!!"];
   const chunk1 = new ToolMessageChunk({
     content: "Hello",
     tool_call_id: "1",
-    raw_output: rawOutputOne,
+    artifact: rawOutputOne,
   });
   const chunk2 = new ToolMessageChunk({
     content: " world",
     tool_call_id: "1",
-    raw_output: rawOutputTwo,
+    artifact: rawOutputTwo,
   });
 
   const concated = chunk1.concat(chunk2);
-  expect(concated.raw_output).toEqual(["Hello", " world", "!!"]);
+  expect(concated.artifact).toEqual(["Hello", " world", "!!"]);
 });
 
-test("Can concat raw_output (object) of ToolMessageChunk", () => {
+test("Can concat artifact (object) of ToolMessageChunk", () => {
   const rawOutputOne = {
     foo: "bar",
   };
@@ -179,16 +179,16 @@ test("Can concat raw_output (object) of ToolMessageChunk", () => {
   const chunk1 = new ToolMessageChunk({
     content: "Hello",
     tool_call_id: "1",
-    raw_output: rawOutputOne,
+    artifact: rawOutputOne,
   });
   const chunk2 = new ToolMessageChunk({
     content: " world",
     tool_call_id: "1",
-    raw_output: rawOutputTwo,
+    artifact: rawOutputTwo,
   });
 
   const concated = chunk1.concat(chunk2);
-  expect(concated.raw_output).toEqual({
+  expect(concated.artifact).toEqual({
     foo: "bar",
     bar: "baz",
   });
diff --git a/langchain-core/src/messages/tool.ts b/langchain-core/src/messages/tool.ts
index 996e2cdba8cc..4567bd91e633 100644
--- a/langchain-core/src/messages/tool.ts
+++ b/langchain-core/src/messages/tool.ts
@@ -10,13 +10,14 @@ import {
 
 export interface ToolMessageFieldsWithToolCallId extends BaseMessageFields {
   /**
-   * The raw output of the tool.
+   * Artifact of the Tool execution which is not meant to be sent to the model.
    *
-   * **Not part of the payload sent to the model.** Should only be specified if it is
-   * different from the message content, i.e. if only a subset of the full tool output
-   * is being passed as message content.
+   * Should only be specified if it is different from the message content, e.g. if only
+   * a subset of the full tool output is being passed as message content but the full
+   * output is needed in other parts of the code.
    */
-  raw_output?: unknown;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  artifact?: any;
   tool_call_id: string;
 }
 
@@ -36,13 +37,14 @@ export class ToolMessage extends BaseMessage {
   tool_call_id: string;
 
   /**
-   * The raw output of the tool.
+   * Artifact of the Tool execution which is not meant to be sent to the model.
    *
-   * **Not part of the payload sent to the model.** Should only be specified if it is
-   * different from the message content, i.e. if only a subset of the full tool output
-   * is being passed as message content.
+   * Should only be specified if it is different from the message content, e.g. if only
+   * a subset of the full tool output is being passed as message content but the full
+   * output is needed in other parts of the code.
    */
-  raw_output?: unknown;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  artifact?: any;
 
   constructor(fields: ToolMessageFieldsWithToolCallId);
 
@@ -63,7 +65,7 @@ export class ToolMessage extends BaseMessage {
     }
     super(fields);
     this.tool_call_id = fields.tool_call_id;
-    this.raw_output = fields.raw_output;
+    this.artifact = fields.artifact;
   }
 
   _getType(): MessageType {
@@ -83,18 +85,19 @@ export class ToolMessageChunk extends BaseMessageChunk {
   tool_call_id: string;
 
   /**
-   * The raw output of the tool.
+   * Artifact of the Tool execution which is not meant to be sent to the model.
    *
-   * **Not part of the payload sent to the model.** Should only be specified if it is
-   * different from the message content, i.e. if only a subset of the full tool output
-   * is being passed as message content.
+   * Should only be specified if it is different from the message content, e.g. if only
+   * a subset of the full tool output is being passed as message content but the full
+   * output is needed in other parts of the code.
    */
-  raw_output?: unknown;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  artifact?: any;
 
   constructor(fields: ToolMessageFieldsWithToolCallId) {
     super(fields);
     this.tool_call_id = fields.tool_call_id;
-    this.raw_output = fields.raw_output;
+    this.artifact = fields.artifact;
   }
 
   static lc_name() {
@@ -116,7 +119,7 @@ export class ToolMessageChunk extends BaseMessageChunk {
         this.response_metadata,
         chunk.response_metadata
       ),
-      raw_output: _mergeObj(this.raw_output, chunk.raw_output),
+      artifact: _mergeObj(this.artifact, chunk.artifact),
       tool_call_id: this.tool_call_id,
       id: this.id ?? chunk.id,
     });